I'm currently using it.
The radio freq. must be so low, or the power output so minimal, that my wrist/forearm can block the signal. Seriously, I just tested my theory about 5 minutes ago.
Keep a clear line of sight, and at least 6" from anything else like your monitor or printer. Which means you have to have it on it's own hub line, and a usb extension to get the receiver away from everything. Which is what I'm going to go buy at Wally World tomorrow.
It'll go through 1/2" of wood, but that's it. You can forget about tinfoil; it's not going to punch through to your neighbor's computer... =)
[Jedi mind trick] You LOVE Palladium. [/mind trick]